421222230101021 has 2 divisors, whose sum is σ = 421222230101022. Its totient is φ = 421222230101020.

The previous prime is 421222230100891. The next prime is 421222230101041. The reversal of 421222230101021 is 120101032222124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295689140836996 + 125533089264025 = 17195614^2 + 11204155^2 .

It is a cyclic number.

It is not a de Polignac number, because 421222230101021 - 2²² = 421222225906717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421222230101041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210611115050510 + 210611115050511.

It is an arithmetic number, because the mean of its divisors is an integer number (210611115050511).

Almost surely, 2^{421222230101021} is an apocalyptic number.

It is an amenable number.

421222230101021 is a deficient number, since it is larger than the sum of its proper divisors (1).

421222230101021 is an equidigital number, since it uses as much as digits as its factorization.

421222230101021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 421222230101021 its reverse (120101032222124), we get a palindrome (541323262323145).

The spelling of 421222230101021 in words is "four hundred twenty-one trillion, two hundred twenty-two billion, two hundred thirty million, one hundred one thousand, twenty-one".